@book{MSMF_1968__16__1_0,
     author = {Lehmann, D.},
     title = {Quelques propri\'et\'es des connexions induites, et fibr\'es \`a groupe structural variable en g\'eom\'etrie d'ordre sup\'erieur},
     series = {Bulletin de la Soci\'et\'e math\'ematique de France. M\'emoire},
     year = {1968},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {16},
     doi = {10.24033/msmf.16},
     zbl = {0184.25301},
     language = {fr},
     url = {https://www.numdam.org/item/MSMF_1968__16__1_0/}
}